content: ""
content: "foo"
content: ''
content: 'foo'

----------------------------------------------------

[
	["property-declaration", [
		["property", ["content"]],
		["punctuation", ":"],
		["string", "\"\""]
	]],
	["property-declaration", [
		["property", ["content"]],
		["punctuation", ":"],
		["string", "\"foo\""]
	]],
	["property-declaration", [
		["property", ["content"]],
		["punctuation", ":"],
		["string", "''"]
	]],
	["property-declaration", [
		["property", ["content"]],
		["punctuation", ":"],
		["string", "'foo'"]
	]]
]

----------------------------------------------------

Checks for strings.